Acidizing corrosion inhibitor applicable to high temperature of 120 to 140 DEG C, and preparation and application thereof

A technology of acidizing corrosion inhibitor and high temperature, applied in chemical instruments and methods, production fluids, wellbore/well components, etc., can solve the problems of easy coking, corrosion inhibitor damage, decline in corrosion inhibition effect, etc., and achieve a simple production process. , good surface activity, low freezing point effect

Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high temperature has seriously damaged the corrosion inhibitor in the acidification fluid, and the corrosion inhibition effect has dropped drastically. The original corrosion inhibitor cannot meet the needs of high-temperature acidification.
At present, the commonly used anti-high temperature acidification corrosion inhibitors in China have the disadvantages of easy coking, delamination, and insufficient stability of dissolution and dispersion at high temperatures, which can not only protect oil well pipes and downhole metal equipment, but also cause formation damage.

Method used

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  • Acidizing corrosion inhibitor applicable to high temperature of 120 to 140 DEG C, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A corrosion inhibitor suitable for high temperature acidification at 120°C, the weight percentage of component A is:

[0058] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 25%;

[0059] 3-methyl-1-pentyn-3-ol: 0.6%;

[0060] Triethanolamine: 2%;

[0061] Pingping plus OS-15: 12%;

[0062] Cetyl-octadecyltrimethylammonium chloride: 5%;

[0063] Methanol: 55.4%.

[0064] B component weight percent is:

[0065] Potassium iodide: 18%;

[0066] Cuprous chloride: 3%;

[0067] Bismuth oxide: 25%;

[0068] 1+1 hydrochloric acid: 54%.

[0069] The batch composition during use is the A liquid of 1 weight part and the B liquid of 0.3 weight part.

[0070] The preparation method is:

[0071] The preparation method of A component is:

[0072] First, add polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt, 3-methyl-1-pentyn-3-ol, and Pingpingjia OS-15 into the enamel reaction kettle in proportion. Slowly hea...

Embodiment 2

[0075] Example 2: A corrosion inhibitor suitable for high temperature acidification at 120°C, the weight percentage of component A is:

[0076] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 26%;

[0077] 3-methyl-1-pentyn-3-ol: 0.5%;

[0078] Triethanolamine: 3%;

[0079] Pingping plus OS-15: 13%;

[0080] Cetyl-octadecyltrimethylammonium chloride: 6%;

[0081] Methanol: 51.5%.

[0082] B component weight percent is:

[0083] Potassium iodide: 16%;

[0084] Cuprous chloride: 2%;

[0085] Bismuth oxide: 30%;

[0086] 1+1 hydrochloric acid: 52%.

[0087] The batch composition during use is the A liquid of 1 weight part and the B liquid of 0.3 weight part.

[0088] Example 2 The preparation method of a corrosion inhibitor suitable for 120°C high-temperature acidification is the same as that of Example 1.

Embodiment 3

[0089] Example 3: A corrosion inhibitor suitable for high temperature acidification at 130°C, the weight percentage of component A is:

[0090] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 27%;

[0091] 3-methyl-1-pentyn-3-ol: 0.4%;

[0092] Triethanolamine: 4%;

[0093] Pingping plus OS-15: 13%;

[0094] Cetyl-octadecyltrimethylammonium chloride: 7%;

[0095] Methanol: 48.6%.

[0096] B component weight percent is:

[0097] Potassium iodide: 14%;

[0098] Cuprous chloride: 1%;

[0099] Bismuth oxide: 35%;

[0100] 1+1 hydrochloric acid: 50%.

[0101] The batch composition during use is the A liquid of 1 weight part and the B liquid of 0.5 weight part.

[0102] Example 3 The preparation method of a corrosion inhibitor suitable for 130°C high temperature acidification is the same as that of Example 1.

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Abstract

The invention relates to an acidizing corrosion inhibitor applicable to a high temperature of 120 to 140 DEG C and a preparation method thereof. The acidizing corrosion inhibitor comprises a component A and a component B, wherein the component A is composed of polycyclic aromatic hydrocarbon methyl chloride pyridine quaternary ammonium salt, 3-methyl-1-pentyne-3-ol, triethanolamine, peregal OS-15, hexadecyl trimethyl ammonium chloride, heptadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride and methanol, and the component B is composed of sodium iodide, cuprous chloride, bismuth oxide and 1+1 hydrochloric acid; during usage, the component B and the component A are successively added into an acidizing fluid. The acidizing corrosion inhibitor is applied to construction for yield increase in a deep well with a temperature of 120 to 140 DEG C and an oil-gas well acidified by 15 to 28% concentrated hydrochloric acid or mud acid and has excellent corrosion inhibition action on corrosion by concentrated hydrochloric acid and mud acid at a high temperature, a corrosion inhibition rate of no less than 98%, a corrosion rate lower than the standard of an industrial first-grade product, good dispersibility in hydrochloric acid, mud acid and an ethanol solution, good surface activity, little coking and a low freezing point.

Description

technical field [0001] The invention relates to a corrosion inhibitor suitable for high-temperature acidification at 120°C to 140°C and its preparation and application. Background technique [0002] With the continuous deepening of oilfield development, more wells are drilled in newly invested development blocks. During the production of oil wells, it is often necessary to increase the recovery rate through acidification. Acid injection causes corrosion of oil well tubing and downhole metal equipment, resulting in great economic losses. Therefore, in the acidizing of oil wells, especially in high-temperature deep wells and ultra-deep wells with concentrated hydrochloric acid and large acid volume, the important task is to solve the problem of corrosion protection of high-temperature acidizing fluids on oil well pipes and downhole metal equipment. In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high tempera...

Claims

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Application Information

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IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/602C09K8/604C09K8/74C09K2208/32E21B43/26
Inventor 解蓓蓓韩文礼张彦军宋有胜张贻刚杨耀辉徐鸿志徐忠苹
Owner BC P INC CHINA NAT PETROLEUM CORP
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